Mechanism for oblique punching.



No. 676,782. Patented lune |a,.|9'0'|.

E. B. STIMPSUN.

MECHANISM FOR OBLIQUE PUNBHING. (0 Model) (Application filed Mar. 21,,1901.1

TNE norms PEYERs $0., Puo'ragn'na, WASHXNGTON, D. c.

UNITED STATES Parent Orrrms.

EDWIN l3. STIMPSON, OF BROOKLYN, NElV YORK.

MECHANISM FOR OBLIQUE PUNCHING.

SPECIFICATION forming part of Letters latent No. 676,782, dated June 18,1901. Application filed March 21,1901. Serial No. 52,162. (No model.)

To all whom it may concern:

Be it known that I, EDWIN B. STIMPsoN, a citizen of the United States,residing in the borough of Brooklyn, in the county of Kings and city andState of New York, have invented certain new and useful Improvements inMeans for Oblique Punching, of which the following is a specification.

This invention relates to punching or forming apertures in materialmainly for ornamental purposes; and itrelates more particularly,although not necessarily, to punching leather for forming parts of theuppers of boots or shoes.

The object of theinvention, broadly expressed, is to provide a tubularpunch adapted for passing through the material to be punched in adirection obliquely to the gem eral surface of the material punched.

In the accompanying drawings, Figure 1 is a sectional elevation of acarrier or holder -for the punches having set therein a series oftubular or hollow punches constructed according to this invention, andFig. 2 is a simi lar view illustrating a slightly-difierent setting ofthe punch. Fig. 3 is a view showing a single punch and its holder foroperation like the needle-bar of a sewing-machine; and Fig. 4 shows apunch similar to that in Fig. 3, detached.

Referring to Fig. 1, A designates the holder of the punches, B the bedwhich supports the material to be punched, and X the said material,which may be leather. The holder A is supposed to move in punching in anoblique path toward the bed B, said path or direction being indicated inFig. 1 by the dotted line or as.

The punches O are set in the holder A obliquely and have their axesparallel in Fig. 1 with the line or direction of movement indicated bythe line w at. These punches when in groups may be made from steeltubing and each being of uniform diameter throughout its length and setin a counterbored socket in the holder, as clearly shown in Fig. 1. Atits cutting end the punch will be brought to a cutting edge by grindingor whetting, and its cutting-face 0 will be parallel at all times withthe surface of the supporting-bed 13, although its axis will be obliqueto said surface and to Thus when the punches pass obits face a.

liquely through the material X the faces 0 thereof will be brought tobear at all points on the surface upon which the material rests.Ordinarily the material punched will be of uniform thickness andsubstantially smooth, and therefore the cutting-face c of the punch willalso be brought to a uniform bearing thereon at the beginning of thepunching operation, although the movement is oblique to the said face.

The punches may of course vary in diamc ter, number, and arrangement atwill. arrangement shown in Fig. 1 is simply illustrative. The carrier orholder A may be mounted in any manner desired and be operated by any ofthe known means, such as levers, toggles, screws, cams, doc. Thesedevices are fully within the skill and knowledge of any machinist andneed not be illustrated herein.

It may be desirable in oblique punching, especially in view of the bevelformed in sharpening the punch, to set the punch at a slightly-differentangle to that of the path of the punch in its movement through the material. This is illustrated in Fig. 2, wherein it will be noted that thedirection of movement cc 0: is slightly less oblique to the perpendicular than the axis of the punch. Indeed, the line a; 00 is in thisview very nearly or quite parallel with the bevel c at the front of thepunch. This construction prevents the face or bevel o from displacing orprying up the material in front of the punch as the latter passesthrough the material.

Fig. 3 illustrates a single punch set in the end of a holder A, whichlatter can be operated in the manner of the needle-bar of asewing-machine, but of course in a path oblique to the surface of thematerial to be punched. In this figure the punch is held in place by aset-screw a; but it may be of the form seen in Fig. 1, which shows athreaded nipple c to screw into the holder.

The punches herein shown are all supposed to produce round holes; butobviously their cutting-faces may have any desired contour, thelatterbeing made to produce an aperture or hole of the shape preferred.

B hollow or tubular unch is herein meant a punch with a sharp cuttingedge adapted for use without a die as distinguished The from anon-tubular punch used with a die into which the punch enters inpunching.

Having thus described my invention, I claim- 1. A hollow or tubularpunch for oblique punching having its sharp cutting edge lying wholly ina plane which is oblique to the axis of the punch, substantially as setforth.

2. Means for oblique punching comprising a holder and tubular punchesset obliquely therein, all of the punches having the same obliquity,substantially as set forth.

3. Means for oblique punching comprising a holder and tubular punchesset obliquely therein and having the same obliquity, said punches havingcutting-faces c oblique to their axes, substantially as set forth.

4:. Ahollow punch formed of atube of uniform diameter throughout itslength, and having its sharp cutting edge lying wholly in a plane whichis oblique to the axis ofthe punch, substantially as set forth.

In Witness whereof I have hereunto signed my name, this 13th day ofMarch, 1901, in the presence of two subscribing Witnesses.

EDWIN B. STIHPSON.

Witnesses HENRY CONNETT, PETER A. Ross.

